The writer and the Preface-writer betray the sad state of affairs regarding medium of exchange, and regarding the history of the Guernsey meat market notes.
Jonathan Duncan (1799-1865) spent 10 years living on the island of Guernsey, during which the Meat Market was built and the Meat Market Notes were circulated. After returning to England, Mr. Duncan spent his time giving lectures, circulating pamphlets and writing books on the subject of government-issued notes and the Guernsey Meat Market Notes. His book, "The Bank Charter Act" published in 1857, in chapter 7, 'National Money' details the story of the Guernsey Notes
http://www.yamaguchy.com/library/duncan/charter_07.html
Somehow these two experts missed Jonathan Duncan's work. There was no need to write this book, only to re-print chapter 7 of Duncan's book. I guess Harris needed the money and wanted the fame by impressing the ignorant.
John Jacob, "Annals of some of the British Norman Isles constituting the Bailiwick of Guernsey" (Paris 1830):
http://www.yamaguchy.com/library/duncan/elizabeth.html
Retford Currency Society
"How can paper money increase wealth ?" (1849) also deals with the Guernsey Meat Market Notes:
http://www.yamaguchy.com/library/kitson/retford.html
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As for the person who scanned the text of this book:
should have done a decent job and prepared the text properly